chore: update docs and scripts

pull/46/head
Stefan Reimer 2 years ago
parent 947e5045f2
commit 23912192ad

@ -0,0 +1,15 @@
# Service Account Tokens
## Federation with AWS IAM
### Discovery
- public S3 location for openid and jwks config files
- synchronized from the api-server to S3 during version upgrades
service-account-issuer: `arn:aws:s3:::${ConfigBucketName}/k8s/${ClusterName}`
api-audiences: `sts.amazonaws.com`
## Projection
## Resources
- https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/#service-account-token-volume-projection
- https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/#service-account-issuer-discovery

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# Upgrade to KubeZero V2.18.0 (Argoless)
## (optional) Upgrade control plane nodes / worker nodes
- Set kube version in the controller config to eg. `1.18`
- Update kube-controller and worker stacks with latest CFN code
- terminate controller node(s)
- once all controller nodes successfully upgraded replace worker nodes in a rolling fashion via. drain / terminate / rinse-repeat
## ArgoCD
- disable all auto-sync and "prune" features to prevent that eg. namespaces from previous apps get removed
- either remove auto-sync from old values.yaml and run deploy one last time, trigger kubezero sync !
- or disable manual via Argo UI starting with Kubezero app itself
- uninstall argo helm chart:
`helm uninstall kubezero -n argocd`
- remove all "argocd.argoproj.io/instance" labels from namespaces to prevent namespace removal later on:
`./scripts/remove_argo_ns.sh`
## KubeZero - Part 1
- migrate values.yaml to new structure, adapt as needed
& update new central kubezero location in git and merge cluster configs
- upgrade all CRDs:
`./bootstrap.sh crds all clusters/$CLUSTER ../../../kubezero/charts`
- upgrade first components:
`./bootstrap.sh deploy calico,cert-manager,kiam,aws-ebs-csi-driver,aws-efs-csi-driver clusters/$CLUSTER ../../../kubezero/charts`
## Istio
Due to changes of the ingress namespace resource the upgrade will cause a brief (~3-5 min) ingress service interruption !
- delete istio operators, to remove all pieces, remove operator itself
`./scripts/delete_istio_17.sh`
- deploy istio and istio-ingress via bootstrap.sh
`./bootstrap.sh deploy istio,istio-ingress clusters/$CLUSTER ../../../kubezero/charts`
- patch all VirtualServices via script to new namespace
`./scripts/patch_vs.sh`
Ingress service interruption ends.
## KubeZero - Part 2
- push kubezero & cluster config to git
- if logging incl. ElasticSearch is installed remove the old ECK operator first:
`./scripts/remove_old_eck.sh`
- upgrade all remaining components and install new ArgoCD:
`./bootstrap.sh deploy all clusters/$CLUSTER ../../../kubezero/charts`
## Verification / Tests
- verify argocd incl. kubezero app
- verify all argo apps status
- verify all the things

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# CloudBender
## Changes
- controller node names are now strictly tight to the AZ they are in: AZ1 -> controller00, AZ2 -> controller01 etc. to prevent controller03 from happening in case AWS launches new instances before the old ones are actually terminated
### Single node control plane
- Control
## Upgrade
- Set Kubernetes version in the controller config to eg. `1.20`
- Update controller and worker stacks with latest CFN code
- Set the specific wanted Kubernetes version in the controller config to eg. `v1.20.2`
- configure your AWS CLI profile as well as your kubectl context to cluster you want to upgrade.
- verify your config ...
- Upgrade requires careful replacement in case existing control planes are shuffled otherwise: ( this might reduce the number of online controllers temporarily to 1 ! )
- manually set controller ASG to Min/Maz 0 for the ASG currently hosting controller00
- terminate controller node in AZ1 which will return as controller00
- replace controller01 and 02 in similar fashion
- run ./scripts/upgrade_120.sh
- update the CFN stack for kube-control-plane
### Single node control plane
- will automatically be upgraded and the controller node replaced as part of the CFN update
### Clustered control plane
- replace controller instances one by one in no particular order
- once confirmed that the upgraded 1.20 control plane is working as expected update the clustered control plane CFN stack once more with `LBType: none` to remove the AWS NLB fronting the Kubernetes API which is not required anymore.
- replace worker nodes in a rolling fashion via. drain / terminate / rinse-repeat

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```
- args:
- -c
- sleep 3600
command:
- /bin/sh
env:
- name: AWS_ROLE_ARN
value: <ARN>
- name: AWS_WEB_IDENTITY_TOKEN_FILE
value: /var/run/secrets/sts.amazonaws.com/serviceaccount/token
image: amazon/aws-cli
imagePullPolicy: Always
name: busybox
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /var/run/secrets/sts.amazonaws.com/serviceaccount/
name: aws-token
readOnly: true
```

@ -4,8 +4,8 @@
https://github.com/jpbetz/auger
## Change a PV object
etcdctl get /registry/persistentvolumes/services-dsny-cache | auger decode > pv.yaml
etcdctl get /registry/persistentvolumes/my_pv | auger decode > pv.yaml
vi pv.yaml
cat pv.yaml | auger encode | etcdctl put /registry/persistentvolumes/services-dsny-cache
cat pv.yaml | auger encode | etcdctl put /registry/persistentvolumes/my_pv

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#!/bin/bash
set -e
# Get all kube-control-plane ASGs in the current account and region
asgs=$(aws autoscaling describe-auto-scaling-groups --output json | jq .AutoScalingGroups[].AutoScalingGroupName -r | grep kube-control-plane)
for asg in $asgs; do
hooks=$(aws autoscaling describe-lifecycle-hooks --auto-scaling-group-name $asg --output json | jq '.LifecycleHooks[] | select (.LifecycleTransition=="autoscaling:EC2_INSTANCE_TERMINATING") | .LifecycleHookName' -r)
for hook in $hooks; do
echo "Delete Lifecycle hook $hook of ASG $asg ? <Ctrl+C> to abort"
read
aws autoscaling delete-lifecycle-hook --lifecycle-hook-name $hook --auto-scaling-group-name $asg
done
done
# unset any AWS_DEFAULT_PROFILE as it will break aws-iam-auth
unset AWS_DEFAULT_PROFILE
nodes=$(kubectl get nodes -l node-role.kubernetes.io/master -o json | jq .items[].metadata.name -r)
for node in $nodes; do
echo "Deploying upgrade job on $node..."
cat <<'EOF' > _job.yaml
apiVersion: batch/v1
kind: Job
metadata:
name: kubezero-upgrade
namespace: kube-system
spec:
template:
spec:
hostNetwork: true
hostIPC: true
hostPID: true
containers:
- name: busybox
image: busybox
command:
- /bin/sh
- -c
- |
cat <<'EOF' > /host/tmp/upgrade.sh
#!/bin/bash -ex
for l in $(cat /etc/environment); do
export $l
done
my_ip=$(ec2metadata --local-ipv4)
my_id=$(ec2metadata --instance-id)
clusterName=$(yq r /etc/kubezero/kubezero.yaml clusterName)
my_asg=$(aws ec2 describe-tags --filters "Name=resource-id,Values=${my_id}" --output json | jq '.Tags[] | select(.Key=="aws:cloudformation:logical-id") | .Value' -r)
[ $my_asg == "KubeControlAsgAZ1" ] && nodename="etcd0-$clusterName"
[ $my_asg == "KubeControlAsgAZ2" ] && nodename="etcd1-$clusterName"
[ $my_asg == "KubeControlAsgAZ3" ] && nodename="etcd2-$clusterName"
zone_name=$(hostname -d)
zone_id=$(aws route53 list-hosted-zones --query 'HostedZones[?Name==`'"$zone_name"'.`].Id' --output text | cut --delimiter="/" --fields=3)
cat <<EOF2 > route53.json
{ "Changes": [ { "Action": "UPSERT", "ResourceRecordSet": { "Name": "${nodename}.${zone_name}", "Type": "A", "TTL": 30, "ResourceRecords": [ { "Value": "$my_ip" } ] } } ] }
EOF2
echo "Updating DNS entry for $nodename to $my_ip"
aws route53 change-resource-record-sets --hosted-zone-id $zone_id --change-batch file://route53.json
echo "Adding additional control shutdown commands"
if [ ! -f /usr/local/sbin/drain_delete_node.sh ]; then
cat <<EOF3 > /usr/local/sbin/drain_delete_node.sh
#!/bin/bash -ex
export LC_TYPE=en_US.UTF-8
export KUBECONFIG=/root/.kube/config
kubeadm reset phase update-cluster-status
kubeadm reset phase remove-etcd-member
EOF3
chmod +x /usr/local/sbin/drain_delete_node.sh
sed -e 's,/usr/local/sbin/backup_control_plane.sh&,/usr/local/sbin/drain_delete_node.sh,' -i /usr/local/sbin/cloudbender_shutdown.sh
fi
echo "Patching ClusterConfig to re-create new etcd server certificates"
yq w /etc/kubezero/kubeadm/templates/ClusterConfiguration.yaml etcd.local.serverCertSANs[+] $nodename > /etc/kubernetes/kubeadm-recert.yaml
rm -f /etc/kubernetes/pki/etcd/server.*
kubeadm init phase certs etcd-server --config=/etc/kubernetes/kubeadm-recert.yaml 2>/dev/null
kill -s HUP $(ps -e | grep etcd | awk '{print $1}')
echo "Waiting for etcd to accept connections again...might take 30s or more"
while true; do
etcdctl member list -w simple 1>/dev/null 2>&1 && break || true
sleep 3
done
EOF
chmod +x /host/tmp/upgrade.sh
chroot /host bash -c /tmp/upgrade.sh
volumeMounts:
- name: host
mountPath: /host
securityContext:
privileged: true
volumes:
- name: host
hostPath:
path: /
type: Directory
nodeSelector:
kubernetes.io/hostname: __node__
tolerations:
- key: node-role.kubernetes.io/master
effect: NoSchedule
restartPolicy: Never
EOF
# set controller node
sed -i -e "s/__node__/$node/" _job.yaml
kubectl apply -f _job.yaml
kubectl wait -n kube-system --timeout 300s --for=condition=complete job/kubezero-upgrade
kubectl delete -f _job.yaml
done
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